His father began to work____he was seventeen years old.A as old a_英语解答

His father began to work____he was seventeen years old.A as old as B as early as B since D while
选什么?为什么?

人气：240 ℃　时间：2019-12-20 20:00:43

解答

while (==when )是正确的选择.A as old as 的后面不能加句子B as early as的后面不能加句子B since 的主句必须是现在完成时D while (== when) 作为连接词,后面的句子谓语动词可以是be动词.又如：-------- He came un...